Note_Tech

All technological notes.

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Linux - Hardware Management: Memory

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• Linux - Hardware Management: Memory
  • CPU
    • Lab: CPU
  • Memory
  • Swap
  • Disk Info

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CPU

CMD	Desc
lscpu	Show CPU architecture
cat /proc/cpuinfo	Print CPU architecture file

Lab: CPU

lscpu
# Architecture:             x86_64
#   CPU op-mode(s):         32-bit, 64-bit
#   Address sizes:          39 bits physical, 48 bits virtual
#   Byte Order:             Little Endian
# CPU(s):                   4
# ...

# key cpu info
lscpu | egrep 'Model name|Socket|Thread|NUMA|CPU\(s\)'
# CPU(s):                               4
# On-line CPU(s) list:                  0-3
# Model name:                           Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz
# BIOS Model name:                      Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz To Be Filled By O.E.M CPU @ 2.5GHz
# Thread(s) per core:                   2
# Socket(s):                            1
# CPU(s) scaling MHz:                   92%
# NUMA node(s):                         1
# NUMA node0 CPU(s):                    0-3

# get physical core
grep 'cpu cores' /proc/cpuinfo | uniq
# cpu cores       : 2

# threads
echo "CPU threads: $(grep -c processor /proc/cpuinfo)"
# CPU threads: 4

# number of processors
nproc --all
# 4

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Memory

CMD	Desc
free	Show free and used memory
free -h	Show free and used memory in human readable size
free -t	showing the column totals.

• Disk space calculation:
  • swap size + /boot size + / size = total Disk size

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Swap

• Swap space
  • an extension of physical RAM, offering virtual memory that helps maintain system stability and performance.

CMD	Desc
swap	Display summary about used swap devices

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Disk Info

CMD	Desc
df -h	Show information about the file system
du -h .	Summarize device usage of the set of FILEs